Vocabulary
What term means the amount of space an object or gas takes up?
WHAT IS VOLUME
When temperature increases, do gas particles move faster or slower?
WHAT IS FASTER
If the volume of a gas decreases, what happens to its pressure?
Pressure increases
If the same amount of matter takes up more space, does its density increase or decrease?
WHAT IS DECREASE
A student says, “When temperature increases, particles move slower.” What is wrong?
WHAT IS Particles move faster when temperature increases.
What term describes the force of particles pushing against the walls of their container?
WHAT IS PRESSUE
When temperature decreases, what happens to particle motion?
WHAT IS It decreases / particles move slower
If the volume of a gas increases, what happens to its pressure?
WHAT IS Pressure decreases
If matter is squeezed into a smaller space, what happens to its density?
WHAT IS Density increases
A student says, “When volume decreases, pressure also decreases.” Correct the statement.
WHAT IS When volume decreases, pressure increases.
What term describes how much matter is packed into a certain amount of space?
WHAT IS DENSITY
A sealed container is heated but cannot expand. What happens to the pressure inside?
WHAT IS Pressure increases
Why does decreasing the volume of a gas increase its pressure?
WHAT IS Particles have less space and hit the container walls more often.
In general, when a substance is heated and expands, what happens to its density?
WHAT IS DENSITY DECREASES
A student says, “Heating a gas makes the particles stop colliding with the container.” Correct the statement.
WHAT IS Heating makes particles move faster and collide more often/with more force.
A gas's particles begin moving faster after being heated. What measurement increased and caused this change in particle motion?
WHAT IS TEMPERATURE
A basketball is left outside on a cold night. Explain what happens to the air particles inside the ball.
WHAT IS They move slower and collide with the walls less often/with less force.
You push down on the plunger of a sealed syringe. What happens to the volume and pressure of the trapped air?
WHAT IS Volume decreases; pressure increases.
Warm air expands and its particles spread farther apart. Is the warm air more dense or less dense than before? Explain.
WHAT IS Less dense because the same matter is spread through more space.
A student says, “If a gas expands, the particles become closer together and density increases.” Identify both mistakes.
WHAT IS Particles spread farther apart, and density decreases.
A gas is squeezed into a smaller container. Its particles are now closer together and collide with the container walls more often. What two vocabulary terms describe the property that decreased and the property that increased?
WHAT IS Volume decreased; pressure increased
A sealed metal can is placed in a hot environment. The can cannot change size. Predict what happens to particle speed, collisions, and pressure inside the can.
WHAT IS Particle speed increases → collisions increase/become stronger → pressure increases.
A gas starts in a large container. It is compressed into half the space without changing its temperature. Predict what happens to particle spacing, wall collisions, and pressure.
WHAT IS Particles become closer together → wall collisions occur more often → pressure increases.
A sealed flexible bag of gas is taken to a place where the outside pressure is lower. The bag expands. Predict what happens to the gas's volume, particle spacing, and density.
WHAT IS Volume increases → particles spread farther apart → density decreases.
A student says, “A basketball left in the cold gets softer because the air particles move faster, causing pressure to increase.” Rewrite the explanation correctly.
WHAT IS Cold temperatures make particles move slower, so collisions decrease and the pressure inside the ball decreases.